Deliberate mistake: In the scene near the beginning of the movie where Ben finds the pipe and finds the message by rolling the pipe on the paper, the message is long and has symbols, but it is impossible for all of that to fit in the pipe. (00:12:00)
Revealing mistake: When Ben, Abigail, and Riley are fleeing the National Archives, the window on the driver's side has been shattered by a gunshot. Although they are driving at high speeds, no wind seems to be entering the van to mess up their hair.
Factual error: In the scene in the Charlotte, the black powder would not burn without creating enormous amounts of thick grey smoke. And the barrels would never have exploded like that. Maybe one or two but never to that degree. More like a succession of explosions.
Continuity mistake: When Ben finds the glasses at Independence Hall, it is 3:20 because of daytime savings time. However when the bad guys chase Abigail and Riley in the market they pass a large clock showing the time to be 2:37. (01:12:15 - 01:17:10)
Continuity mistake: When Ian and Ben are sitting on a couple of barrels discussing what the riddle means, there are a couple of balls hanging from chains very close to Ian's head. A scene or two later, there are a couple of oblong, round, flat bottomed things hanging down next to Ian's head that actually brush against the fur on his hood. Next scene, nothing is close to his head and then the balls come back and then nothing again.Sheri Hartman
Continuity mistake: When we see Ian's men pull up over the grate that they are going to go down through to get to the National Archive, we see the street wet so it had to have rained, been hosed down, etc. But when one of Ian's men drops a large bag down, it whirls up a huge cloud of dust when it lands. This shouldn't have happened because there was nothing over the tunnel but a grate and some water would have gone down the tunnel, wetting the dust.Sheri Hartman
Continuity mistake: Near the beginning of the movie when Ben, Ian and Riley are in snow CATS and we see Riley's computer screen, viewed a little from the left, and there is a jiggling hula dancer, supposedly mounted on his keyboard surface. In the background, a window has popped up showing the location and route of the two CATS. Then we hear alarm go off and we see almost the same shot but a little closer in on the computer screen. The hula girl is missing. The difference in angle and "zoom level" could not account for not seeing the hula girl in the second shot.Sheri Hartman
Continuity mistake: As Ian watches our heroes leave Independence Hall the clock in the tower reads 3:27. That gave Ben only five minutes to climb down the tower, dig out the brick, meet up downstairs, unroll the Declaration and decipher it, realize they're being followed, plan their escape and leave. It took me longer to write all of that.Kristal
Continuity mistake: When they get ready to climb into the tunnel left by removing the coffin, Ian says, "McGregor, Phil. You stay here." When you see the people coming through the tunnel, it's not Viktor and Shaw as you would expect but Shaw and McGregor. Don't know if Sean blew his line, the writers got the characters mixed up or the actors blew it, but something went amiss.Sheri Hartman
Continuity mistake: When Riley is sitting in the car waiting for Ben, the window is gone and shards of glass can be seen in the window frame, but there has been no shooting yet. Later, the window is back and then it gets hit by a bullet and shatters.
Other mistake: When Ben, Riley, and Abigail show up at Ben's fathers house, the screen shows a title stating they are now in Philadelphia, PA. However, when Ben's father confesses that he donated the Silence letters, he says "I donated them to the Franklin Institute in Philadelphia." Normally when you tell someone where something is, you don't include the city if you are located in that city at the time. (Not to mention that I'm sure Ben knows exactly where that museum is anyway). This coincides with the next scene where you see sky shots of downtown Philadelphia and the Ben Franklin Bridge, implying they are driving into the downtown area. That means they would be coming in from New Jersey. Maybe Ben's father is supposed to be living in Jersey somewhere, and not in Philadelphia.